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Mail that cannot be delivered or returned to sender

"Dead letter" redirects here. For other uses, see Dead letter (disambiguation).

Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender.

This is usually due to lack of compliance with postal regulations, an incomplete address and return address, or the inability to forward the mail when both correspondents move before the letter can be delivered.

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Largely based on the British model that emerged in the late eighteenth century, many countries developed similar systems for processing undeliverable mail.

The term "dead mail" is perhaps a misnomer, and several jurisdictions have opted for the use of the term "undeliverable mail" as more clearly representing the status of the item whose transmission has been impeded.

As it is performed by internal departments within postal administrations, little information about the dead letter office function has